Duct pipe & steel

In this video you can see how to fix pipe and steel for underground utility ducts.
Pipe dia 200mm
Steel 12mm
I want to ask two questions from viewers
1) why pipe length is more than steel?
2) There is a technical fault/mistake in this work can you find out?

[@shahidkiani9170]

1) why pipe length is more than steel? 2) There is a technical fault/mistake in this work can you find out?